I've got one beside me right now. Love it. IDK which clone it is, the B&M I bought it from couldn't (or wouldn't, they kinda suck) tell me.
I highly disagree about using magnets in the switch. I tried that when I first got it and the magnets broke on me within a week when they got slightly off center. I was out when it happened, so I was stuck for a few hours with no nicotine. As a former 2-3 PAD smoker and a current chain vaper, I was not happy at all.
They were nice while they lasted, but if I were to try them again I'd get 13 OD x 9 ID x 2 mm magnets instead of the 13 x 9 x 1 mm that's normally sold for it.
Luckily my switch is pretty smooth as-is though. I had some misfires when I first got it, but it's worked itself to perfect. Mine came with 2 springs. One bigger, thinner one and one smaller, thicker one.
Now some copper contacts and/or a 4-piece hybrid kit (2-piece only works with Kayfun 3.1, 4-piece works with just about any atty) would be an excellent upgrade and can be found for cheap in several places.